A message is composed of a key and a value. Both the key and the value are byte arrays. If you don't explicitly supply a key, one is generated automatically.

The message is published to a partition in the stream. If there is more than one partition, the partition where the message is published is calculated using the message's key. If the key is null, the partition is calculated using a random 16-byte value.

For messages with a null key, do not expect messages with same value to go on the same partition, since the partitioning scheme may change. Passing a null key will put the message in a random partition. If you want to ensure that messages with the same value go to the same partition, you should use the same key for those messages.

Required IAM Policy

To use Oracle Cloud Infrastructure, you must be given the required type of access in a An IAM document that specifies who has what type of access to your resources. It is used in different ways: to mean an individual statement written in the policy language; to mean a collection of statements in a single, named "policy" document (which has an Oracle Cloud ID (OCID) assigned to it); and to mean the overall body of policies your organization uses to control access to resources. written by an administrator, whether you're using the Console or the REST API with an SDK, CLI, or other tool. If you try to perform an action and get a message that you don’t have permission or are unauthorized, confirm with your administrator the type of access you've been granted and which A collection of related resources that can be accessed only by certain groups that have been given permission by an administrator in your organization. you should work in.